The North Face Men's Thermoball Jacket
Ace your next multiday backpacking trip with this durable and highly packable jacket featuring a bottleneck quilting pattern and ultralight ThermoBall™ fill for an excellent warmth-to-weight ratio and fewer cold spots.
Developed in partnership with Primaloft, Inc., ThermoBall is a revolution in insulation technology. Unlike traditional continuous-filament synthetic insulation, the small, round PrimaLoft synthetic-fiber clusters closely mimic down clusters, trapping heat within small air pockets to retain warmth. Independent clo testing by Kansas State University has shown that ThermoBall has warmth equivalent to 600 fill goose down. As a result, ThermoBall can offer the lightweight warmth and compressibility of down with the wet-weather insulating performance of synthetic insulation.